If you right-click on some user and chose BROWSE you can browse his shared files without problems. Of course you have to make a rule in your Zone Alarm like I posted above, otherwise you won't be able to browse their shared folders.
The other thing... if you mean some more extensive file transfer, you have to use some third party client... even UltraVNC, pcAnywhere can be very useful. Hamachi is here primarily to establish a tunnel connection, to allow you to create/join those networks you want to be part of.
